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The Collaborative International Dictionary
Bisector

Bisector \Bi*sec"tor\, n. One who, or that which, bisects; esp. (Geom.) a straight line which bisects an angle.

Douglas Harper's Etymology Dictionary
bisector

1821; agent noun from bisect.

Wiktionary
bisector

n. (context geometry English) A line or curve that bisects or divides a line segment, angle, or other figure into two equal parts.

Wikipedia
Bisector (music)

In diatonic set theory, a bisector divides the octave approximately in half and may be used in place of a generator to derive collections for which structure implies multiplicity is not true such as the ascending melodic minor, harmonic minor, and octatonic scales. Well formed generated collections generators and bisectors coincide, such as in the diatonic collection. The term was introduced by Jay Rahn (1977), who considers any division between one and two thirds as approximately half and who applied the term only the equally spaced collections. Clough and Johnson both adapt the term to apply to generic scale steps. Rahn also uses aliquant bisector for bisectors which may be used to generate every note in a collection, in which case the bisector and the number of notes must be coprime. Bisectors may be used to produce the diatonic, harmonic minor, and ascending melodic minor collections. (Johnson 2003, p.97, 101, 158n10-12)

Usage examples of "bisector".

The median to the base of an isosceles triangle is the perpendicular bisector of the base!